公开(公告)号：US20150268325A1

公开(公告)日：2015-09-24

申请号：US14466976

申请日：2014-08-23

Applicant: Electronics and Telecommunications Research Institute

Inventor： YoungHyoun KWON ,  JiEun CHOI ,  HuiRae CHO ,  Jaeki LEE ,  Heesun PARK ,  Jingak JANG ,  Jinhyun KIM ,  Jieun KIM ,  Inho HWANG

IPC: G01S3/14

CPC classification number: G01S3/14

Abstract: An apparatus and method for estimating a direction of an RF signal are provided. The apparatus includes an antenna unit, a preliminary correction unit, a signal processing unit, a conversion unit, and a signal direction estimation unit. The antenna unit receives an RF signal from at least one antenna. The preliminary correction unit performs preliminary correction depending on whether the at least one antenna is an antenna having directional gain. The signal processing unit generates an analog signal by performing a frequency shift on the RF signal or a signal on which the preliminary correction has been performed. The conversion unit converts the analog signal into a digital sample. The signal direction estimation unit extracts the phase of the antenna from the digital sample, and estimates the direction of the RF signal based on the extracted phase.

Abstract translation: 提供了一种用于估计RF信号的方向的装置和方法。 该装置包括天线单元，初步校正单元，信号处理单元，转换单元和信号方向估计单元。 天线单元从至少一个天线接收RF信号。 初步校正单元根据至少一个天线是否是具有方向增益的天线来进行初步校正。 信号处理单元通过对RF信号进行频移或者进行了初步校正的信号来生成模拟信号。 转换单元将模拟信号转换为数字样本。 信号方向估计单元从数字采样中提取天线的相位，并且基于所提取的相位来估计RF信号的方向。

公开(公告)号：US20200228897A1

公开(公告)日：2020-07-16

申请号：US16254680

申请日：2019-01-23

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Chi Hoon CHOI ,  Ji Eun CHOI ,  Young Jun LEE ,  Heesun PARK ,  Young Hyoun KWON ,  Sae-Hoon JU ,  Kyung-Hoon LEE

IPC: H04R3/00

Abstract: An apparatus and method for preventing an electronic device from recording. The apparatus includes a control unit for generating a first modulation signal and controlling the components of the apparatus; a first modulation unit for modulating the first modulation signal to an FM signal; an ultrasonic signal generation unit for generating an ultrasonic signal, the frequency of which is adjusted by changing the value of at least one of a variable resistor and a variable capacitor depending on the magnitude of the FM signal; an amplification unit for increasing or decreasing the magnitude of the ultrasonic signal; a resonance unit for increasing the voltage to be applied to a transducer by generating resonance; and an ultrasound output unit for converting electrical signals into ultrasonic signals using the transducer and radiating a recording prevention signal, converted into the ultrasonic signal, to the microphone of an electronic device.